/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.editor.policies;

import java.util.List;

import org.apache.pig.pigpen.editor.commands.QueryComponentDeleteCommand;
import org.apache.pig.pigpen.editor.model.Operator;
import org.apache.pig.pigpen.editor.model.Query;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editpolicies.ComponentEditPolicy;
import org.eclipse.gef.requests.GroupRequest;

public class OperatorComponentEditPolicy extends ComponentEditPolicy {
    public Command getCommand(Request request) {
        if (REQ_DELETE.equals(request.getType()))
            return createDeleteCommand((GroupRequest) request);
        return null;
    }

    protected Command createDeleteCommand(GroupRequest deleteRequest) {
        Query query = ((Operator) getHost().getModel()).getQuery();
        List toDelete = deleteRequest.getEditParts();
        QueryComponentDeleteCommand command = new QueryComponentDeleteCommand();
        command.setQuery(query);
        command.setDeleteList(toDelete);
        return command;
    }
}
